/Engine/Source/Editor/SubobjectEditor/Public/SSubobjectEditor.h
Add a component from the selection in the combo box
[FSubobjectDataHandle](API\Editor\SubobjectDataInterface\FSubobjectDataHandle) PerformComboAddClass ( [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UActorComponent](API\Runtime\Engine\Components\UActorComponent) > ComponentClass, [EComponentCreateAction::Type](API\Editor\UnrealEd\EComponentCreateAction__Type) ComponentCreateAction, [UObject](API\Runtime\CoreUObject\UObject\UObject) * AssetOverride )